Backlight module

ABSTRACT

A backlight module is disclosed, which includes an outer frame having a sidewall and a hole formed on the sidewall, an inner frame disposed inside of the outer frame, and an adhesive device. The inner frame includes a block wall and a support. The block wall has an inner surface, an outer surface, and a breakable section. The outer surface is in contact with the sidewall, and the breakable section is disposed corresponding to the hole. The adhesive device is disposed on the support.

RELATED APPLICATIONS

The present application is a divisional of U.S. application Ser. No.13/206,222, filed on Aug. 9, 2011, which was based on, and claimspriority from, Taiwan Patent Application Serial Number 099138375, filedNov. 8, 2010, the disclosure of which is hereby incorporated byreference herein in its entirely.

BACKGROUND

1. Field of Invention

The present invention relates to a liquid crystal display. Moreparticularly, the present invention relates to a backlight module.

2. Description of Related Art

Recently, liquid crystal displays (LCD) have been widely applied inelectrical products, due to the rapid progress of optical technology andsemiconductor technology. Moreover, with the advantages of high imagequality, compact size, light weight, low driving voltage, and low powerconsumption, LCDs have been introduced into portable computers, personaldigital assistants, color televisions, and are gradually replacing thecathode ray tubes (CRT) used in conventional displays. LCDs have becomethe mainstream display apparatus.

The LCD mainly includes a liquid crystal display panel, a backlightmodule, and a bracket. The backlight module provides the light source,which includes a light bar, a light guide plate, and a frame. The liquidcrystal display panel is stuck on the frame of the backlight module witha double side adhesive tape, and then the liquid crystal display paneland the backlight module are assembled in the bracket.

FIG. 1 is a sectional diagram of a conventional backlight module. Thebacklight module 100 includes an outer frame 110, and inner frame 120,and a light guide plate 130. The inner frame 120 is disposed inside ofthe outer frame 110. The inner frame 120 has a block wall 122 and asupport 124 connected to the block wall 122. The support 124 is disposedon the inner surface of the block wall 122. The outer surface of theblock wall 122 is in contact with the outer frame 110. The light guide130 is placed on the outer frame 110. A liquid crystal display panel 190is placed on the support 124 of the inner frame 120. The backlightmodule 100 further includes an adhesive device 140 for fastening theliquid crystal display panel 190 on the support 124. The adhesive device140 can be a double adhesive tape. The liquid crystal display panel 190is fastened on the support 124 tightly with the adhesive device 140, sothat it is difficult to separate the liquid crystal display panel 190from the backlight module 100 directly, and that may cause unwanteddamages.

The double adhesive tape would tightly fasten the liquid crystal displaypanel on the frame, thus it is difficult to separate the liquid crystaldisplay panel from the backlight module directly but not raise todamages of the liquid crystal display panel and the backlight module,and the breakable process becomes difficult when there is a need torepair or change the liquid crystal display panel.

SUMMARY

An object of the invention is to provide a backlight module to preventthe liquid crystal display panel or the backlight module from beingdamaged during the breakable process.

An aspect of one embodiment of the invention provides a backlightmodule, which includes an outer frame having a sidewall and a holeformed on the sidewall, an inner frame disposed inside of the outerframe, and an adhesive device. The inner frame includes a block wall anda support. The block wall has an inner surface, an outer surface, and abreakable section. The outer surface is in contact with the sidewall,and the breakable section is disposed corresponding to the hole. Theadhesive device is disposed on the support.

The breakable section can include an opening communicated with the hole,and the adhesive device has an extending portion extending from a sideof the adhesive device and inserting into the opening. An edge of theextending portion aligns an outer surface of the outer frame. Theextending portion is extended through the hole and is stuck on an outersurface of the outer frame. The backlight module further includes aliquid crystal display panel positioned on the support with the adhesivedevice, wherein the extending portion is exposed to the liquid crystaldisplay panel. The outer frame includes a bottom plate connected to thesidewall vertically, and the inner frame includes a bottom portiondisposed above the bottom plate, and the hole further penetrates to thebottom plate. The breakable section can include a pre-cut section, andthe pre-cut section is broken from the hole to destroy a part of theadhesive device, which is disposed at the breakable section. Thebacklight module further includes a notch disposed on an end of thepre-cut section, wherein the notch is disposed on the bottom portion anddoes not cut through the inner frame. An end of the pre-cut section canbe separated from the inner frame. The backlight module can furtherinclude a connecting neck disposed at an end of the pre-cut section forconnecting the pre-cut section and the inner frame. The pre-cut sectionincludes a pulling structure, and the pulling structure is exposed fromthe hole. The pulling structure can be a slot or a protrusion.

The breakable section is formed on the inner frame of the backlightmodule of the invention, and the adhesive device disposed above thebreakable section can be easily destroyed during the breakable process.Therefore the liquid crystal display panel can be separated from thebacklight module easily, and the damages of the liquid crystal displaypanel or the backlight module during the breakable process can bereduced.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention. In the drawings,

FIG. 1 is a sectional diagram of a conventional backlight module;

FIG. 2 is an oblique diagram of a first embodiment of the backlightmodule of the invention;

FIG. 3 is a schematic diagram of a second embodiment of the backlightmodule of the invention;

FIG. 4 is a sectional diagram of a third embodiment of the backlightmodule of the invention;

FIG. 5A to FIG. 5C are schematic diagrams of different embodiments ofthe breakable section in FIG. 4; and

FIG. 6A and FIG. 6B are operating schematic diagrams of different statesof the third embodiment of the backlight module in FIG. 4.

DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the present embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers are used in thedrawings and the description to refer to the same or like parts.

FIG. 2 is an oblique diagram of a first embodiment of the backlightmodule of the invention. The backlight module 200 includes an outerframe 210, and inner frame 220 and an adhesive device 240. The outerframe 210 has a sidewall 212, and a hole 214 formed on the sidewall 212.The inner frame 220 is disposed inside of the outer frame 210. The innerframe 220 includes a block wall 222 and a support 224. The block wall222 has an inner surface, an outer surface. The support 224 is disposedon the inner surface of the block wall 222, and the outer surface of theblock wall 222 is in contact with the outer frame 210. A liquid crystaldisplay panel 290 is disposed on the support 224 and is positioned bythe block wall 222. The adhesive device 240 is disposed between thesupport 224 and the liquid crystal display panel 290. The adhesivedevice 240 adheres to the support 224 and the liquid crystal displaypanel 290 respectively, so that the liquid crystal display panel 290 ispositioned on the support 224 with the adhesive device 240.

The block wall 222 of the inner frame 220 has a breakable section 250.The breakable section 250 is disposed corresponding to the hole 214. Thebreakable section 250 can be an opening. The breakable section 250 iscommunicated with the hole 214. That is, the opening of the breakablesection 250 is disposed corresponding to the hole 214 and it results toform a through hole in outer frame 210 and inner frame 220 via the hole214 aligning to opening of the breakable section 250. The adhesivedevice 240 can be a twin adhesive tape. The adhesive device 240 furtherincludes an extending portion 242. The adhesive device 240 and theextending portion 242 are configured as a T-shaped structure or anL-shaped structure. The adhesive device 240 and the extending portion242 are configured as an L-shaped structure in this embodiment. Theextending portion 242 is extended from a side of the adhesive device 240and inserts into the opening of the breakable section 250. The breakablesection 250 and the extending portion 242 thereon are exposed to theliquid crystal display panel 290. That is, the liquid crystal displaypanel 290 thereon does not cover the breakable section 250 and theextending portion 242. The length of the extending portion 242 is atleast for inserting to the opening of the breakable section 250. In oneor some embodiments, the edge of the extending portion 242 aligns anouter surface 216 of the outer frame 210, referred to FIG. 2.

The breakable process of separating the liquid crystal display panel 290with the backlight module 200 can start at the opening of the breakablesection 250. The extending portion 242 on the opening of the breakablesection 250 is not covered by the liquid crystal display panel 290, andthe extending portion 242 can be easily peeled from the inner frame 220to break the adhesive state between the adhesive device 240 and theinner frame 220. Therefore the liquid crystal display panel 290 can beeasily peeled from the backlight module 200.

FIG. 3 is a schematic diagram of a second embodiment of the backlightmodule of the invention. The backlight module 200 includes the outerframe 210, the inner frame 220, and the adhesive device 240. The hole214 is formed on the sidewall 212 of the outer frame 210. The breakablesection 250 formed on the inner frame 220 is the opening. The liquidcrystal display panel 290 is disposed on the support 224 and ispositioned by the block wall 222. The adhesive device 240 is disposed onthe support 224 to fasten the liquid crystal display panel 290 on thesupport 224. The extending portion 242 of the adhesive device 242inserts to the opening of the breakable section 250. In one or someembodiments, the extending portion 242 is extended over the hole 214 andis stuck on the outer surface of the sidewall 212. In other words, theextending portion 242 is extended through the hole 214 to exceed theouter surface of the sidewall 212, referred to FIG. 3. The extendingportion 242 exposed to the outer surface of the sidewall 212 results toprovide an easy way to peel of the adhesive device 240.

There is a particular ratio between the adhesive device 240 and theextending portion 242 thereof, so that the breakable function can beprovided after peeling the extending portion 242 to break the adhesivestate of the adhesive device 240. For example, the length ratio of theextending portion 242 to the adhesive device 240 can be 1 to 10 in thesame width. The length of the adhesive device 240 is closer to orsmaller than the extending portion 242 to be easier to peel the adhesivedevice 240 by tearing the extending portion 242 off. However the ratioof the extending portion 242 to the adhesive device 240 is related tothe weight and the size of the liquid crystal display panel 290. Userscan design the ratio thereof according to the requirement.

FIG. 4 is a sectional diagram of a third embodiment of the backlightmodule of the invention. The backlight module 300 includes the outerframe 310, the inner frame 320, and the adhesive device 340. The outerframe 310 has the sidewall 312 and a bottom plate 316, wherein thebottom plate 316 is connected to the sidewall 312 vertically. The outerframe 310 has the hole 314, and the hole 314 is formed on the sidewall312 and the bottom plate 316. The hole 314 formed on the sidewall 314further penetrates the bottom plate 316. The inner frame 320 has theblock wall 322 and the support 324. The liquid crystal display panel 390is disposed on the support 324 and is positioned by the block wall 322.The adhesive device 340 is disposed on the support 324 to fasten theliquid crystal display panel 390 on the support 324. The inner frame 320has the breakable section 350. The inner frame 320 has a bottom portion326 disposed above the bottom plate 316. The breakable section 350 isdisposed corresponding to the hole 314, and a part of the adhesivedevice 340 is disposed on the breakable section 350.

FIG. 5A to FIG. 5C are schematic diagrams of different embodiments ofthe breakable section in FIG. 4. The outer frame 310 has been omittedfor better description in FIG. 5A to FIG. 5C. The breakable section 350a is a pre-cut section, which means this segment has been cut partiallybut has not been cut through. The breakable section 350 a is formedwithin the hole 314 (see FIG. 4). A first notch 352 a is formed on anend of the breakable section 350 a, or two first notches 352 a areformed on opposite ends of the breakable section 350 a to define thebreakable section 350 a. The first notch 352 a is cut from the bottomportion 326 of the inner frame 320. The first notch 352 a disposed onthe bottom portion 326 does not cut through the inner frame 320. Thefirst notch 352 a would be enlarged to break the inner frame 320 when anexternal force is applied on the breakable section 350 a, thus the endof the breakable section 350 a would be separated from and does notconnect to the inner frame 320.

In one or some embodiments, referred to FIG. 5B, a part of the adhesivedevice 340 is disposed above the breakable section 350 b. The breakablesection 350 b is a pre-cut section. The breakable section 350 b isdisposed within the hole 314 (see FIG. 4). A second notch 352 b isformed on an end 353 of the breakable section 350 b. The second notch352 b cuts through the inner frame 320 completely, and the end 353 ofthe breakable section 350 b would be separated from and does not connectthe inner frame 320. The second notch 352 b can be a break point whenthere is an external force applied on the breakable section 350 b.Another end of the breakable section 350 b can connect with the innerframe 320 in whole. But it is not limited to. In one or someembodiments, another end of the breakable section 350 b can optionallyhave the first notch 352 a (see FIG. 5A). The breakable section 350 bcan be defined by the first notch 352 a and the second notch 352 b.

In FIG. 5C, a part of the adhesive device 340 is disposed above thebreakable section 350 c. The breakable section 350 c is a pre-cutsection. The breakable section 350 c is disposed within the hole 314(see FIG. 4). A connecting neck 354 is disposed on an end 353 of thebreakable section 350 c. The connecting neck 354 can reduce thesectional area of the breakable section 350 c connected to the innerframe 320. The end 353 of the breakable section 350 is connected withthe inner frame 320 by the connecting neck 354. The connecting neck 354would be broken and the connecting between the breakable section 350 cand the inner frame 320 would be destroyed when there is an externalforce applied on the breakable section 350 c. Another end of thebreakable section 350 b can connect with the inner frame 320 in whole.But it is not limited to. In one or some embodiments, another end of thebreakable section 350 c can optionally have the first notch 352 a (seeFIG. 5A) or another connecting neck 354. The breakable section 350 c canbe defined by the connecting neck 354 and the first notch 352 a or theconnecting neck 354.

As disclosed above, the first notch 352 a, the second notch 352 b, andthe connecting neck 354 can be selected and arranged according to actualrequirement. The arrangement and the combination are not limited by thedisclosed embodiments.

FIG. 6A and FIG. 6B are operating schematic diagrams of different statesof the third embodiment of the backlight module in FIG. 4. The breakablesection 350 is disposed in the hole 314 and exposed to the hole 314. Thebreakable section 350 is a pre-cut section. The breakable section 350includes a pulling structure 356, and the pulling structure 356 isexposed to the hole 314. The pulling structure 356 is disposed on thebottom or the side of the breakable section 350. The pulling structure356 can be a slot or a protrusion. In one or some embodiments, the hole314 is only formed on the sidewall 312, not extended to the bottom plate315 (not shown). The pulling structure 356 is disposed on the side ofthe breakable section 350 to expose to the hole 314.

As shown in FIG. 6A, users can use finger or tool to apply an externalforce on the pulling structure 356 for pulling the pulling structure 356and bending the breakable section 350 from the hole 314. The breakablesection 350 can be bent as shown in FIG. 6B, and the part of theadhesive device 340 (see FIG. 4) is destroyed. The adhesive statebetween the breakable section 350 and the part of the adhesive device340 is broken, thus the adhesive device 340 can be further peeled fromthe part disposed above the breakable section 350. Other adhesivedevices 340 placed at different sides can also be peeled easily due tothe destroyed part of the adhesive device 340. Therefore, the liquidcrystal display panel 390 (see FIG. 4) can be easily separated from theinner frame 320 during the breakable process and would not be damagedduring breakable process.

In this embodiment, only one end of the breakable section 350 would bebroken and bent from the hole 314, and another end of the breakablesection 350 is still connected to the inner frame 320. The part of theadhesive device 340 (see FIG. 4) would be destroyed and becomes beingremoved easily during the liquid crystal display panel breakableprocess. The breakable section 350 can be inserted into the hole 314after the liquid crystal display panel is breakableed, and another newadhesive device can stick on the breakable section 350 and the innerframe 320 to fasten the breakable section 350, and the liquid crystaldisplay panel 390 is further disposed on the adhesive device.

FIG. 6A and FIG. 6B show that only one end of the breakable section 350is departed from the inner frame 320, and the breakable section 350 isbent from the hole 314. But it is not limited to, the breakable section350 may have more than one notch. In one or some embodiments, thebreakable section 350 may also be completely separated from the innerframe 320 when there are notches disposed on opposite ends of thebreakable section 350 or due to over bending the breakable section 350.However, the ratio of the breakable section 350 to the inner frame 320is small that support function of the inner frame 230 for supporting theliquid crystal display panel would not be reduced due to lacking thepart of the inner frame 320 (the breakable section 350). The adhesivedevice on the inner frame 320 (without breakable section 350) can stilladhere the liquid crystal display panel on the inner frame 320 andmaintain liquid crystal display panel fix on the inner frame 320.

According to above embodiments, the present invention has the followingadvantages. The breakable section is formed on the inner frame of thebacklight module of the invention, and the adhesive device disposedabove the breakable section can be easily destroyed during the breakableprocess. Therefore the liquid crystal display panel can be separatedfrom the backlight module easily, and the damages of the liquid crystaldisplay panel or the backlight module during the breakable process canbe reduced.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. A backlight module comprising: an outer framehaving a sidewall and a hole formed on the sidewall; an inner framedisposed inside of the outer frame, the inner frame comprising: a blockwall having an inner surface, an outer surface, and a breakable section,wherein the outer surface is in contact with the sidewall, and thebreakable section is disposed corresponding to the hole, wherein thebreakable section comprises an opening communicated with the hole; and asupport disposed on the inner surface of the block wall; and an adhesivedevice disposed on the support, wherein the adhesive device has anextending portion extending from a side of the adhesive device to insertinto the opening, wherein the extending portion is extended through thehole and is stuck on an outer surface of the outer frame.
 2. Thebacklight module of claim 1, further comprising a liquid crystal displaypanel positioned on the support with the adhesive device, wherein theextending portion is exposed to the liquid crystal display panel.
 3. Abacklight module comprising: an outer frame having a sidewall and a holeformed on the sidewall; an inner frame disposed inside of the outerframe, the inner frame comprising: a block wall having an inner surfaceand an outer surface, wherein the outer surface is in contact with thesidewall; and a support disposed on the inner surface of the block wall;a breakable section disposed corresponding to the hole, wherein an endof the breakable section is separated from the inner frame, a connectingneck for physically connecting an end of the breakable section to theinner frame, wherein a cross-sectional area of the connecting neckconnected to the inner frame is smaller than a cross-sectional area ofthe inner frame; the inner frame, the breakable section, and theconnecting neck are one-piece formed and are made of the same material;and an adhesive device disposed on the support.